Another Democratic challenger to Sen. Kirsten GillibrandKirsten GillibrandStates battle each other for equipment in supply chain crunch The Hill's Campaign Report: Biden struggles to stay in the spotlight Biden fights for attention in coronavirus news cycle 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 ObamaMore than 400,000 people barred from becoming citizens due to coronavirus: report Poll finds public evenly split on delayed Supreme Court ObamaCare decision Samantha Power: UN covering up Russia's role in Syria bombings 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 SchumerHealth care workers account for 20 percent of Iowa coronavirus cases Pressure mounts on Congress for quick action with next coronavirus bill Schumer names coronavirus czar candidates in plea to White House 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.