Press: Obama 'evolves' while Romney 'flip-flops'

Even the Columbia Journalism Review has noted the biased coverage of the two presidential candidates:

Why have Obama and Romney’s “evolutions” been covered so differently? As Joshua Green of Bloomberg Businessweek noted on Twitter, the difference between the candidates is far less clear than the media coverage would suggest. In both cases, electoral incentives are the primary factor shaping the positions that candidates publicly profess. When those incentives change, so do their positions.