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By Kevin Murphy

KANSAS CITY, Mo., Aug 7 (Reuters) – Three Missouri

Republicans are in a political free-for-all for the party

nomination on Tuesday to challenge U.S. Senator Claire

McCaskill, who political analysts consider the most vulnerable

Democratic incumbent in the country this November.

The U.S. Senate primary race in Missouri is drawing the most

national attention as voters in three other states – Michigan,

Washington and Kansas – also go to the polls on Tuesday.

St. Louis businessman John Brunner held a narrow poll lead

over conservative Congressman Todd Akin and former state senator

Sarah Steelman as the tight Missouri race hurtled toward a

close. Akin and Steelman were within striking distance and many

voters were undecided.

“With the high undecided vote and the frenzy of the final

week, it’s anybody’s race,” said Steve Glorioso, a political

consultant who has worked on past McCaskill campaigns, but not

yet this year.

A recent poll also showed that any one of the three

challengers could knock off McCaskill in November, good news for

Republicans in their effort to pick up at least four seats in

the U.S. Senate and take the majority.

McCaskill is struggling in a state that has gone

increasingly Republican after being a bellwether in presidential

elections for a century. McCaskill’s support of Democratic

President Barack Obama’s healthcare reform has hurt her in the

state, Glorioso said.

Brunner, who has never run for political office, is another

in a string of insurgent Republican candidates who have shown

they can upset the party establishment in Senate races this

year. Brunner has bankrolled his own campaign and led most of

the way.

Insurgents in Indiana, Nebraska and Texas have upset

traditional Republicans, and others are running strong races in

Arizona and Wisconsin.

The last poll before the Missouri vote published on Sunday

by Democratic firm Public Policy Polling, showed Brunner with 35

percent, Akin with 30 and Steelman with 25 percent. One-in-ten

voters were undecided.

In Michigan, another incumbent Democratic U.S. senator,

Debbie Stabenow, is doing much better and has been comfortably

ahead of any Republican challenger in recent polls.

The best known Republican in the Michigan race, former

Congressman Peter Hoekstra, has been prone to gaffes that have

hampered his campaign. Hoekstra’s first campaign ad this year

was criticized as racist because it featured an Asian woman on a

bicycle speaking broken English in an attempt to accuse Stabenow

of selling out U.S. interests to China.

Hoekstra was leading his Tea Party movement-backed opponent

Clark Durant in final polls before the voting.

Washington state’s primary advances the top two candidates

in the vote count to the November election rather than holding

separate Republican and Democratic primary elections.

Incumbent Democratic U.S. Senator Maria Cantwell is expected

to cruise into the top two for the November election over a

crowded but little-known field of challengers.

In Kansas, there is no U.S. Senate election this year and

all four incumbent members of Congress are Republicans expected

to sail through the primary.

(Writing and additional reporting by Greg McCune; Editing by

Vicki Allen)