As Mitt Romney widens his lead on the field of GOP presidential candidates, the front-runner is searching from a narrowing list of potential vice presidential candidates who can perhaps deliver on the intangibles that voters say his candidacy still needs.

GOP Rep. Paul Ryan appears to be in the top mix of any list, to be sure. The Wisconsin congressman campaigned in his home state with Romney for five days around the Tuesday primary, helping the former Massachusetts governor win convincingly in a three-state sweep.

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