By The Associated Press
JEFFERSON CITY, MO (AP) - Republican Roy Blunt and Democrat Robin Carnahan have been campaigning against each other for almost a year and a half in Missouri's U.S. Senate race.
On Tuesday, they may finally become their parties' nominees.
Carnahan, Missouri's secretary of state, is expected to win the Democratic primary against two little-known candidates.
Blunt, a U.S. House member, is expected to prevail in a nine-way Republican primary that features a tea party favorite, state Sen. Chuck Purgason.
The candidates are competing to replace Republican Kit Bond, who is retiring after 24 years in the Senate.
Carnahan has criticized Blunt's ties to lobbyists and corporations. Blunt has labeled Carnahan a rubber stamp for President Barack Obama.