But YouGov show a conference boost for the Lib Dems
So far tonight we've seen ICM and Opinium polls showing the Conservatives on the up. Unlike the other two polls, YouGov's fieldwork was conducted entirely on Sunday evening and Monday, so would have been entirely after the Samantha Cameron interview and a good weekend of publicity for the Liberal Democrats including Nick Clegg's keynote speech on Sunday. It seems to be the latter that has had more of an effect upon YouGov's figures.
The topline figures are CON 37%(nc), LAB 32%(-1), LDEM 21%(+4). It is the highest YouGov score for the Lib Dems since September and the similar boost they recieved from their party conference then. For what it's worth the Conservative lead is up by 1 point (the actual result was about 37.49% so it was almost 2) but it's rather swamped by that surge in Liberal Democrat support.
I expect it is purely a short term publicity boost and we will see the Lib Dem level of support rapidly fade away again during the rest of the week. However, it is a very optimistic sign for the Liberal Democrats and what might happen to their support when they start getting more media coverage in the election campaign proper, and the opportunities that the leader debates present for Nick Clegg.