The poll tracker measures opinion poll support for the Conservatives, Labour, Liberal Democrats, Green Party and UKIP ahead of the 2015 general election.
Compare the parties' current ratings from a range of pollsters, and see how they have performed since 2010.
More than 55 million people must abide by the two strictest levels after MPs approved the measures.
The effects will be felt in the real world, but the Tory rebellion was a political moment too.
Ministers are "taking limited responsibility" for readiness ahead of the transition period ending, MPs say.