President Obama continues his campaign bus trip across Iowa. He's traveling from west to east, drawing sharp contrasts with the Republican ticket. Obama warned some jobs could be in jeopardy if a wind power tax credit is allowed to expire, as Romney has proposed.
With Jeb Bush signaling he's likely to run for president in 2016, it's another sign that the presidential announcement season is underway. Here's a look at who has jumped in the race early and what to expect in the coming months.
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