Wisconsin law generally prevents candidates from seeking two offices at the same time. However, it provides an exception when one of the offices is either president or vice president.
Ryan has represented the 1st Congressional District for seven terms.
The Janesville Republican will be running for an eighth term at the same time that he and Romney will be trying to defeat President Barack Obama. If Ryan prevails in both races, his election as vice president would void his congressional win. A special election would be held to fill the congressional vacancy.
Ryan is being opposed by Democrat Rob Zerban in the congressional race