Sorry but people on the Obama side can no longer argue about Romney flip-flopping (of which I have no doubt he has done) after his "evolution" with gay marriage.
And arguing bias with polls is silly. If it was the other way around, we'd be seeing headlines about how Obama is leading Romney and few to none would question the bias of pollsters.
I tend to look at aggregates of professional polls rather than individual ones. The aggregation shows that the race is tightening and Romney is closing. However, knowing the history of any polling company--especially if you're going to use a single poll as proof of anything--should be important.
As for Obama on Gay Marriage, this was him coming out pretty amazingly in support of something morally and ethically right while also leaving himself open to political risk (he hopes to win NC, which just by 60% voted to ban gay marriage).
Besides, all politicians change positions, as cynically frustrating as that is to say. However, Romney has literally been on both sides of
every major issue likely more than once.
In the 1990s he ran as a proponent of gay rights and promised the citizens of Massachusetts he'd be a better friend to the gay community than Ted Kennedy.
He wrote an op-ed called "Let Detroit Go Bankrupt" and then takes credit for the Auto Rescue working.
He passed a
universal healthcare bill with an individual mandate in Massachusetts and is now running against "Obamacare" by calling it socialism.
He has been for and against the Paul Ryan plan.
He flipped in the matter of 4 hours between supporting and opposing Ohio in stripping public workers of the right to unionize, twice.
He has both believed and denied climate change/global warming.
He's supported immigration reform and then positioned himself in the primary as further right on the subject than Santorum and Perry.
Today he is opposed of making politics "personal" or bringing up Rev. Wright when he did that himself on Hanniy in February and blitzkreiged both Santorum and Gingrich in the primaries.
There are countless other examples. I just am tired of writing them down. Romney is the most dishonest politician to run for POTUS that I can think of in the last 20 years. Doesn't mean he'd be the worst (thinks of Bauchman, Santorum, Perry, Paul and Dubya and shudders), but that man has one belief: He should be president. Everything else is negotiable in that regard.