Two years of tax returns show that Mitt Romney paid about 14 percent last year on $21 million in income. This year's it will be 15 percent on another $20 million, about half the rate paid by Newt Gingrich and President Obama on much smaller earnings. At the same time, Romney's popularity's on the decline. Newt Gingrich claims his consulting contract with Freddie Mac did not make him a lobbyist, but polls show increasing doubts about him, too. We preview the last week of the Florida primary campaign.