The leading congressional contenders to be Mitt Romney’s running mate have significantly different legislative track records that accentuate their pros and cons.

On Capitol Hill, Sen. Marco Rubio (R-Fla.), Sen. Rob Portman (R-Ohio) and House Budget Committee Chairman Paul Ryan (R-Wis.) top the vice presidential shortlists of many handicappers.

Further down on those lists are Sen. John Thune (R-S.D.) and Sen. Kelly Ayotte (R-N.H.).

Each of the vice presidential contenders has strengths that the Romney campaign could tout. And each has weaknesses that Democrats would sink their teeth into.

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