Sen. Amy KlobucharAmy KlobucharSenate Democrats demand answers on migrant child trafficking during pandemic Senate Democrats push to include free phone calls for incarcerated people in next relief package Lobbying world MORE (D-Minn.) is the most popular senator running for reelection, while Joe Lieberman (I-Conn.) is the least, according to new polling data.

Public Policy Polling (PPP), a Democratic-leaning firm, looked at the approval ratings for 59 senators during the second half of 2010, and several of them will face voters in 2012. The senators were ranked by the spread between their approval numbers and disapproval numbers.

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Of the 59, Klobuchar is the most popular, with an approval rating of 59 and a disapproval of 29 (a 30-point spread), while Lieberman has an approval rating of 33 and a disapproval of 54 (a 21-point spread).

Lieberman hasn't said what he'll do in 2012, but Klobuchar is preparing for rivals, including a possible challenge from Tea Party darling Rep. Michele BachmannMichele Marie BachmannEvangelicals shouldn't be defending Trump in tiff over editorial Mellman: The 'lane theory' is the wrong lane to be in White House backs Stephen Miller amid white nationalist allegations MORE (R-Minn.).

Coming in second was Sen. Scott Brown (R-Mass.), who's also up in 2012. He had a 53 percent approval and 29 percent disapproval (a 24-point spread). Sen. Judd Gregg (R-N.H.), who is retiring, was third, and Sen. Olympia Snowe (R-Maine), also up in 2012, was fourth, with a 56 percent approval and 34 percent disapproval (a 22-point spread).

Of other senators up in 2012, near the bottom were Sens. Claire McCaskillClaire Conner McCaskillDemocratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally Missouri county issues travel advisory for Lake of the Ozarks after Memorial Day parties MORE (D-Mo.) — 43 approval/44 disapproval; Bob CaseyRobert (Bob) Patrick CaseySenate Democrats demand answers on migrant child trafficking during pandemic The Hill's Coronavirus Report: Rep. Fred Upton says it is 'tragic' to see Americans reject masks, social distancing; Russia claims it will approve COVID-19 vaccine by mid-August People with disabilities see huge job losses; will pandemic roll back ADA gains? MORE Jr. (D-Pa.) — 36 approval/40 disapproval; and John Ensign (R-Nev.) — 41 approval/48 disapproval.
   
Retiring Sen. Roland Burris (D-Ill.) came in last, with a 19 percent approval rating and a 58 percent disapproval rating.

PPP's Tom Jensen notes in his analysis that "the average approval rating for a senator right now is 43 percent approving to 40 percent disapproving" and that "there's very little difference in the average approval of Republican senators versus Democratic senators." The average GOP senator had a 43/37 split, while the average Democrat rated a 44/41. 

Several senators up for reelection came in under the 50 percent approval mark, including: Sens. Ben CardinBenjamin (Ben) Louis CardinPPP application window closes after coronavirus talks deadlock  Congress eyes tighter restrictions on next round of small business help Senate passes extension of application deadline for PPP small-business loans MORE (D-Md.), Kay Bailey Hutchison (R-Texas), Tom CarperThomas (Tom) Richard CarperNot a pretty picture: Money laundering and America's art market OVERNIGHT ENERGY: Trump's pitch to Maine lobstermen falls flat | White House pushed to release documents on projects expedited due to coronavirus | Trump faces another challenge to rewrite of bedrock environmental law NEPA White House pushed to release documents on projects expedited due to coronavirus MORE (D-Del.), Jon Kyl (R-Ariz.), Jim Webb (D-Va.), Kirsten GillibrandKirsten GillibrandExpanding our health force can save lives and create jobs simultaneously Sanders offers bill to tax billionaires' wealth gains during pandemic Senate Democrats demand answers on migrant child trafficking during pandemic MORE (D-N.Y.), Sherrod BrownSherrod Campbell BrownOvernight Defense: Guardsman to testify Lafayette Square clearing was 'unprovoked escalation' | Dems push for controversial Pentagon nominee to withdraw | Watchdog says Pentagon not considering climate change risks to contractors Democrats urge controversial Pentagon policy nominee to withdraw Chamber of Commerce, banking industry groups call on Senate to pass corporate diversity bill MORE (D-Ohio), Bill NelsonClarence (Bill) William Nelson Trump, facing trouble in Florida, goes all in NASA names DC headquarters after agency's first Black female engineer Mary W. Jackson NASA, SpaceX and the private-public partnership that caused the flight of the Crew Dragon MORE (D-Fla.), Maria CantwellMaria Elaine CantwellThe Hill's Coronavirus Report: Mike Roman says 3M on track to deliver 2 billion respirators globally and 1 billion in US by end of year; US, Pfizer agree to 100M doses of COVID-19 vaccine that will be free to Americans Overnight Energy: Supreme Court reinstates fast-track pipeline permit except for Keystone XL | Judge declines to reverse Dakota Access Pipeline shutdown OVERNIGHT ENERGY: Watchdog accuses Commerce of holding up 'Sharpiegate' report | Climate change erases millennia of cooling: study | Senate nixes proposal limiting Energy Department's control on nuclear agency budget MORE (D-Wash.) and Debbie StabenowDeborah (Debbie) Ann StabenowACLU calls on Congress to approve COVID-19 testing for immigrants Senators press IRS chief on stimulus check pitfalls Democrats warn Biden against releasing SCOTUS list MORE (D-Mich.).