A new Emerson College poll released Thursday shows Democrats holding a 10-point advantage over Republicans on the congressional ballot, with 50.3 percent support among likely voters compared to 39.5 percent for Republicans. The survey found 10.2 percent of participants remained undecided about which party they would support.

The polling results come as political forecasters are adjusting their predictions for Senate races. Sabato's Crystal Ball, a prominent election forecasting service, has shifted three Senate races in favor of Democratic candidates, indicating what they describe as a clearer path for Democrats to win majority control of the upper chamber.

In Maine, the Democratic Senate primary has concluded with Graham Platner winning the nomination to challenge incumbent Republican Senator Susan Collins in the general election. The race is among those being closely watched as part of the broader Senate map.

The shifts in polling and forecasting represent changes in the political landscape as the midterm elections approach. Democrats are seeking to maintain control of both chambers of Congress, while Republicans aim to regain majorities they lost in previous election cycles.

The congressional ballot polling reflects voter preferences for which party they would support for House and Senate seats, serving as a general indicator of the political environment. However, individual races can vary significantly from national trends based on local factors and candidate quality.