A national police force?

Elizabeth Price Foley notes at Instapundit that

Al Sharpton is calling for the creation of a national police force. And it looks like President Obama is considering the option. While the federal government undoubtedly lacks a “police power” and the concomitant authority to create a national police force, it does have a “spending power,” implied from the Constitution’s enumerated power to levy taxes, and the Supreme Court has upheld the imposition of “strings,” or conditions, on the receipt of federal funds.

Read more here.