Republican presidential hopeful Herman Cain is claiming his race will help him win over African American voters.

In a seven-page mailer sent to Iowans over the weekend, Cain writes, "as a descendent of slaves I can lead the Republican Party to victory by garnering a large share of the black vote, something that has not been done since Dwight Eisenhower garnered 41 percent of the black vote in 1956."

But while Cain might believe he'll garner a larger share of the black vote in a head-to-head match-up against President Obama, this month's NBC/WSJ poll — which had an oversample of 400 African-American respondents — tells a different story.

In a hypothetical general election matchup, according to the poll, Obama gets support from 93 percent of African Americans, while Cain gets just 6 percent.

Against Romney, Obama performs similarly among black voters. Ninety-two percent of African Americans would support Obama, versus just six percent for Romney. According to the 2008 exit polls, Obama got 95 percent of the African American vote.

Even with sliding poll numbers, Cain has attracted large crowds at recent events — but supporters attending Cain rallies are overwhelmingly white.

The mailer is the latest sign of Cain's increased fundraising haul at work. The campaign raised more than $1 million for its “Iowa Fund,” and earlier this month Cain announced he had brought in more than $9 million since Oct. 1.