Check this out, the National Journal Magazine has compiled a ranking of the Senators and Representatives based upon their 2009 votes, published Feb 27, 2010
Click here for the House ratings. See which two Arizona Representatives are tied for first.
Click here to see which key votes were included in the ratings. The votes were categorized either Economic, Social, Foreign Relations.
Here is another ranking website–Senate Conservatives Fund. This is from their website:
SCF is a political action committee dedicated to electing true conservative leaders to the United States Senate.
Their ranking was done from the 2008 votes