With a key test of the GOP presidential field just over a month and a half away, candidates are descending on Iowa this week to sharpen their appeal to voters in the first caucus state.

Four announced or potential Republican candidates, including former Alaska Gov. Sarah Palin (R), are visiting the Hawkeye State this week — as is the man they are looking to defeat in 2012: President Obama.

The president will make a speech at an Alcoa factory in Davenport, Iowa, on Tuesday to promote his agenda for the manufacturing sector and the economy.

Since there won’t be a competitive Democratic race in the state due to Obama’s presence at the top of the ticket, much of the attention in Iowa has been heaped on the myriad Republican presidential hopefuls vying for votes. But Obama will look to provide counter-programming to the GOP with his Iowa stop.

Palin will also create buzz regarding her presidential plans when she travels with her husband, Todd, to Pella, Iowa, on Tuesday to attend the premiere of a documentary film that lauds her political career, titled “The Undefeated.”

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