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Last Updated: Wednesday, 20 February 2008, 07:52 GMT
In pictures: Wisconsin primary

Barack Obama in Houston, Texas, 20/2/08

Barack Obama joins in the applause at a campaign stop in Houston, Texas, after winning the Democratic primary election in Wisconsin, extending his lead over Hillary Clinton.

Hillary Clinton campaigns in Youngstown, Ohio, on Tuesday evening

But the race for the Democratic presidential nomination is far from over. Mrs Clinton marches on, this time to Ohio. Both Ohio and Texas vote on 4 March.

Polling station in Wisconsin

Voting had taken place in freezing temperatures in the northern state of Wisconsin.

Voting at the village polling station in Hortonville, Wisconsin, on Tuesday 19 February 2008

Democratic voters have been inspired by the close contest between the two hopefuls, consistently turning out in greater numbers than Republicans.

Residents of Cecil, Wisconsin, wait to cast their votes

And despite the cold, there was again a heavy turnout in many areas. With 97% of the ballots counted, Mr Obama had secured 58% of the vote to Mrs Clinton's 41%.

A voter casts his ballot in Cedarburg, Wisconsin

Mr Obama has won more states, but has only a small lead in delegates over Mrs Clinton due to her victories in some big states such as California and New York.

Republican candidate John McCain at a rally in Wisconsin on Tuesday 19 February 2008

On the Republican side, front-runner John McCain won Wisconsin to confirm his strong lead over party rival Mike Huckabee.

Obama supporters distribute information in Honolulu, Hawaii

Meanwhile in Hawaii, Obama supporters distributed information ahead of the state's caucus, which began later on Tuesday.

US poll battle moves to Wisconsin
20 Feb 08 |  Americas

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