A doctor who posted a sign at his practice asking Obama supporters to seek care "elsewhere" will end up denying service to many African Americans, Rep. Alan GraysonAlan GraysonPennsylania Dems file ethics complaint against Rep. Barletta The Hill's 12:30 Report Why Republicans took aim at an ethics watchdog MORE (D-Fla.) said Friday.

Dr. Jack Cassell, an opponent of the healthcare law President Barack ObamaBarack Hussein ObamaReport: FCC chair to push for complete repeal of net neutrality Right way and wrong way Keystone XL pipeline clears major hurdle despite recent leak MORE signed last month, put up the sign at his office in Grayson's district.

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"Well, in fact, where he lives, in Mount Dora, which is in my district, many, many of the Democrats who live in Mount Dora happen to be African-Americans," Grayson said on CNN. "So, by saying that he will not treat somebody who supported Obama, he's saying that he's not going to treat a large number of African-Americans in the community."

Grayson, a freshman who represents a Republican-leaning district, gained national attention during the healthcare debate last year when he said the GOP's healthcare plan was for seniors to "die quickly."

Cassell has said that he is not violating medical ethics rules.

"I'm not turning anybody away — that would be unethical," Cassell, 56, told the Orlando Sentinel on Thursday. "But if they read the sign and turn the other way, so be it."

But Grayson said that he was violating the rules and that he will probably be disciplined by medical licensing authorities.

"How many people walked in -- walked up to his front door, saw the sign, and turned away?" he asked. "How many people referred from other physicians in the community, including primary care physicians, how many patients saw that sign and walked away?"

Asked what kind of punishment Cassell should receive, Grayson said "Well, whatever the medical authorities think he should get. But it is a clear violation of ethics, and it's a particularly ugly one. Why is it that the right wing is so preoccupied with denying people health? Why is that?"