Chris Rennard was appointed as a life peer on the recommendation of Lord (Paddy) Ashdown in 1999 in Paddy's final list of recommendations when he was standing down as Liberal Democrat Leader. Chris Rennard had been appointed as Director of Campaigns & Elections for the Liberal Democrats in 1989, in the aftermath of the party's disappointing fourth place and 6% share of the vote in the European elections of that year. By 1997, the party had increased its representation at Westminster from 19 MPs (who had come from the Liberal Party and the SDP) to a total of 46 MPs (winning 17% of the vote that year). In the elections of 1999, the party elected 10 MEPs (5 women and 5 men), 17 members of the Scottish Parliament and 6 members of the Welsh Assembly.

Chris Rennard was Director of Campaigns & Elections, and then Chief Executive, for the General Elections fought with Charles Kennedy as Leader (and with Lord Tim Razzall as Chair of Campaigns & Communications). The party increased its number of MPs in the 2001 and 2005 General Elections to 52 (19% of the vote) and then to 62 (22% of the vote). This was the highest number of "Liberal" MPs since Lloyd George's Liberal Party had also elected 62 MPs in 1922.

The party's recovery from its 1989 low point was based on Chris Rennard's drive for a significant switch to a "targeting strategy" for General Elections, parliamentary by-election successes and local election growth. He oversaw three parliamentary by-elections gains by the Liberal Democrats in 13 months between 1990 and 1991 (with Paul Jacobs as agent). The most significant turning point for the party was the Eastbourne parliamentary by-election in 1990 when a 16,923 Conservative majority was turned into a Liberal Democrat majority of 4,550 and the party's opinion poll rating increased from 8% to 18%.

The Liverpool Edge Hill by-election in 1979 was Chris Rennard's first major parliamentary by-election campaign (aged 18) and he learned much from mentors in the Liverpool Liberal Party such as Trevor Jones (known as "Jones the vote"), Cyril Carr and David Alton. The Liberal by-election win at Edge Hill (with a 30% swing) helped the Liberal Party to survive the very difficult 1979 General Election. When the Edge Hill constituency did not survive the 1983 parliamentary by-election review, Chris Rennard was David Alton's agent for the new Mossley Hill constituency which was then won (from third place) with the biggest General Election swing (14%) against the Conservatives anywhere in England and at the height of Mrs. Thatcher's popularity.
Between 1982 and 2009, Chris Rennard worked for the party professionally as a constituency agent, Area Agent, Elections Co-ordinator, Director of Campaigns & Elections and Chief Executive. He was an active member of the Association of Liberal Councillors (ALC) writing many of the party's campaign and training manuals, conducting many training sessions on campaigns and helping in many of the "Alliance" parliamentary by-elections (including the Greenwich victory in 1987. He was awarded the MBE for political service in 1989, the same year that he married Ann McTegart, a fellow party activist from Liverpool.

For the Liberal Democrats, Chris Rennard oversaw 13 parliamentary by-election successes between 1990 and 2006 including Christchurch in 1993 (which was won by a 35% swing, exceeding that against any government in any by-election since 1918), Leicester South in July 2004 (in which Parmjit Singh Gill was elected) and Dunfermline & West Fife in March 2006 (won by Willie Rennie in the immediate aftermath of divisions in the party following Charles Kennedy's resignation as Leader).

Chris Rennard was instrumental in the introduction of a gender balance mechanism ("zipping") for the European Elections in 1999 which ensured that the three European Parliament elections of 1999, 2004 and 2009 all produced gender balanced outcomes with between 10 and 12 Liberal Democrat MEPs in each of those elections. He was also responsible for the introduction of the "target seat strategy" that gave much greater opportunity for Liberal Democrat candidates to become MPs, if they did not have significant personal resources (particularly cash). As a result, the number and proportion of Liberal Democrat women MPs increased in both the General Elections in which he was most closely involved at national level.

In the House of Lords, Chris Rennard has mostly spoken on political and constitutional reform issues. He led for the party on the Political Parties Elections and Referendum Bill (2000) that set the framework for the rules governing party finance etc. He fought to replace large donor funding of parties, with limited state funding. He has campaigned against abuses of the postal vote system and helped to bring about some reforms. He has spoken out strongly and voted for Lords Reform at every possible stage. In this Parliament, he was responsible for changing proposals to move electoral registration to as "US" style entirely 'voluntary' system that would have greatly favoured the Conservatives. He was also responsible in the House of Lords for the cross-party amendment that blocked the proposed review of parliamentary boundaries. This would also have given the Conservatives a very significant and unfair advantage in the next General Election. He also speaks in the Lords on other issues including some of those associated with public health including diabetes and smoking. He has also been involved in many Inter-Parliamentary Union (IPU) events.

In the middle of the 2009 local and European election campaigns, allegations were made against him in relation to his use of House of Lords allowances. He was completely exonerated by the House of Lords authorities five months later (October 2009). In order to prevent those allegations being an issue in those elections, and as a result of medical advice, be brought forward his resignation as the party's Chief Executive. At that point, the party had 63 MPs and controlled 29 principal authority local councils, with over 4,000 Councillors.

A week before the Eastleigh parliamentary by-election of 2013, in which he was playing an active role, more personal allegations were made against him in the media. He voluntarily stood aside from the Liberal Democrat group in the House of Lords and the Federal Policy Committee (to which he had been elected) whilst these allegations were investigated. A seven month Metropolitan Police Service investigation resulted in the Police deciding that there would be no charges and they did not send a file to the Crown Prosecution Service. A four month inquiry by an independent QC, Alistair Webster, then concluded that there should be "no further action" on the basis that there was "insufficient evidence to proceed any further". The alternative would have been to hold a disciplinary hearing, and if charges were proved, then sanctions could have been applied.

Alistair Webster's report has not yet been published and it was withheld from Lord Rennard himself for eleven weeks. He was suspended from the party (and thereby the Lib Dem group in the Lords) by the English Party's "Regional Parties Committee" on the basis that his "criticisms of party processes" had gone further than they considered "necessary". The "Webster report" did not "recommend" that he apologise, but he apologised in relation to the suggestion in the report that he may have "encroached on the personal space" of some of the complainants. The party's "English Appeals Panel" ruled that he could not be criticised over the 'apology issue' as the report had been withheld from him. The disciplinary action ended, and his suspension from the party and the Lib Dem group in the Lords was lifted in August 2014. The "Regional Parties Committee," that had begun the action in January, agreed with a second independent investigator that the evidence of bringing the party into disrepute by "criticising party processes" was insufficient to put to a disciplinary hearing.

Chris Rennard

Speaking in the House of Lords

At Liverpool Lib Dems dinner marking 40 years since we took control of Liverpool City Council in 1973

With Ken Dodd at Liverpool Town Hall when Mike Storey retired as Lord Mayor

Chris at Lib Dem Christmas Party with Lady Rennard