I also know that Mr. Chambliss (R.GA.) of the Senate is on board. I don't know what other senators have signed on.
Yes, there is a similar bill in the Senate.
S.25
Fair Tax Act of 2005 (Introduced in Senate)
January 24, 2005
Mr. CHAMBLISS introduced the following bill; which was read twice and referred to the Committee on Finance
To promote freedom, fairness, and economic opportunity by repealing the income tax and other taxes, abolishing the Internal Revenue Service, and enacting a national sales tax to be administered primarily by the States.
Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled,
http://thomas.loc.gov/cgi-bin/query/F?c109:1:./temp/~c109pfufG9:e414: