Another Democratic challenger to Sen. Kirsten GillibrandKirsten Elizabeth GillibrandChris Murphy’s profile rises with gun tragedies Overnight Energy: Dems take on Trump's chemical safety pick Dems lambaste Trump’s ‘outrageous’ EPA chemical safety pick MORE (D-N.Y.) dropped out of the race on Tuesday, further clearing the field for the new senator as she heads into her first reelection bid.

In a statement, Manhattan Borough President Scott Stringer, who had formed an exploratory committee, said he will focus on his reelection campaign instead of pursuing the Senate.

Stringer's announcement comes four days after Rep. Steve Israel (D-N.Y.) also announced that he won't run against Gillibrand.

Israel noted that President Barack ObamaBarack Hussein ObamaAll five living former presidents to attend hurricane relief concert Overnight Health Care: Schumer calls for tying ObamaCare fix to children's health insurance | Puerto Rico's water woes worsen | Dems plead for nursing home residents' right to sue Interior moves to delay Obama’s methane leak rule MORE urged him to clear the Democratic primary for Gillibrand, something Stringer also noted in his statement.

"In light of President Obama's clear desire to avoid a Democratic primary in New York state, I have decided to focus on my re-election race for Manhattan Borough President and to suspend my exploratory committee and fund-raising efforts for the 2010 Senate race," Stringer said.

The Hill reported Tuesday that Obama and, in particular, Sen. Charles SchumerCharles (Chuck) Ellis SchumerOvernight Health Care: Schumer calls for tying ObamaCare fix to children's health insurance | Puerto Rico's water woes worsen | Dems plead for nursing home residents' right to sue Crying on TV doesn't qualify Kimmel to set nation's gun agenda Trump knocks ‘fake’ news coverage of his trip to Puerto Rico MORE (D-N.Y.) have gone on the offensive to try to prevent a messy Democratic Senate primary next year.

Other New York Democratic representatives are looking at the race. Congresswoman Carolyn Maloney (D-N.Y.), in particular, is reportedly telling people that she will run.

Rep. Carolyn McCarthyCarolyn McCarthyWhy Congress needs an openly atheist member, now Lobbying World Lobbying world MORE (D-N.Y.) has also indicated she is considering at the race.

jeremy.jacobs@thehill.com