John McCain’s home-state approval numbers have dropped considerably, according to a Public Policy Polling (PPP) survey released Thursday.

McCain -- whom the poll cites as having “now become the least popular Senator in the country,” -- registers an approval rating of just 30 percent with Arizona voters. Fifty-four percent of respondents disapprove of the job the senator is doing, while 16 percent are not sure, according to the poll by the Democratic-aligned outfit.

McCain is unpopular across all political party affiliations, the survey says, scoring a weak 35 percent positive approval rating with fellow Republicans, against a 55 percent disapproval rating with GOP voters.

Though he is not up for reelection until 2016, the poll cites McCain’s unpopularity as a sign of his vulnerability. McCain survived a 2010 primary challenge from conservative former talk show host J.D. Hayworth by running hard to his right. McCain went on to defeat his Democratic opponent by 24 points in a year in which Republican congressional candidates had great success nationwide.