Republican presidential candidate Scott Walker smiles at Pat's King of Steaks in Philadelphia on July 28. (Matt Rourke/AP)

Republican presidential hopeful Scott Walker has canceled two speeches he was scheduled to give next weekend in Michigan and California so that he can instead spend time meeting voters in South Carolina and Iowa.

Walker has steadily fallen in early polls, worrying his fundraisers, donors and prominent supporters. When the Wisconsin governor launched his presidential campaign in mid-July, he was considered one of the top-tier candidates and seemed on track to win the Iowa caucuses. Now he is registering single-digit support and trying desperately to jump-start his campaign. A poll released Friday by Quinnipiac University found that just 3 percent of likely caucus goers in Iowa would pick Walker, down from 18 percent in July. That puts Walker in 10th place in Iowa. Leading that poll is Donald Trump at 27 percent, followed by retired neurosurgeon Ben Carson at 21 percent and Sen. Ted Cruz of Texas at 9 percent.

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Next weekend, Walker was scheduled to give the keynote address at the California Republican Party's fall convention in Anaheim on Saturday evening. The Los Angeles Times reports that Walker "abruptly canceled his planned speech" that had been a major draw for organizers. Walker has also canceled plans to speak at the Mackinac Republican Leadership Conference on Friday evening, according to a campaign spokeswoman, Kirsten Kukowski.

Instead, she said, the governor will hold campaign events in Iowa and South Carolina.