EMILY's List has already weighed in on behalf of Hochul, suggesting just that. In a statement endorsing Hochul last week, EMILY's List President Stephanie Schriock argued, "In a special election where millionaire opponents could split the vote, Kathy’s strong candidacy gives Democrats an excellent opportunity to take back a GOP-held seat."

The group will use its list of donors and activists to offer Hochul some much-needed fundraising help. Hochul had just $306,000 cash on hand as of the end of last month, compared to more than $500,000 for Corwin.

The Democratic Congressional Campaign Committee has yet to make any moves to boost Hochul, but given numbers that show the Democrat within striking distance of Corwin, the committee is sure to face pressure to weigh in.

National Republicans, meanwhile, do plan to get involved in the race.

The chairman of the National Republican Congressional Committee, Rep. Pete Sessions (Texas), is set to travel to the district later this month for a fundraiser and campaign rally with Corwin. House Speaker John BoehnerJohn Andrew Boehner4 reasons Mike Pompeo will succeed at Foggy Bottom The misunderstood reason Congress can’t get its job done GOP sees McCarthy moving up — if GOP loses the House MORE (R-Ohio) is expected to do the same in May. 

The Siena poll surveyed 484 likely voters and has a margin of error of 4.5 percent.

— Sean J. Miller contributed.