MADISON, Wis. -

The four Republican Senate candidates in Wisconsin are making a final push across the state in advance of Tuesday's primary election.

Former Gov. Tommy Thompson, businessman Eric Hovde, former U.S. Rep. Mark Neumann and state Assembly Speaker Jeff Fitzgerald are all running for the spot.

The race was overshadowed earlier this year by the recall campaign against Gov. Scott Walker. Then on Saturday Wisconsin's political scene blew up again with Mitt Romney's selection of U.S. Rep. Paul Ryan as his running mate.

All four Senate candidates joined Romney and Ryan at a campaign stop in Waukesha on Sunday. The candidates were spread out across the state on Monday making stops to rally with supporters and to generate excitement.

Numerous other local races are also on Tuesday's ballot.