Paul Ryan has a backup plan.

In addition to being Republican Mitt Romney's running mate, the Wisconsin congressman is seeking re-election to the U.S. House. Ryan has held his 1st District seat in southeast Wisconsin since 1998.

State law allowed Ryan to run for VP and Congress at the same time.

It's been an uphill climb for his challengers for the House, Democratic businessman Rob Zerban and Libertarian Keith Deschler. Zerban tried for weeks — unsuccessfully — to get Ryan to debate him.

And what if Ryan wins twice Tuesday?

He would have to resign from Congress and a special election would be held to fill the House seat.

— Dinesh Ramde — Twitter http://twitter.com/dramde

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EDITOR'S NOTE — Election Watch shows you Election Day 2012 through the eyes of Associated Press journalists. Follow them on Twitter where available with the handles listed after each item.