RealClearPolitics keeps a regularly updated page of polling data on all U.S. Senate races. The website links to data gathered by both national polling sources and local media organizations following the races in their respective states.
RealClearPolitics lists the data in a table with four sections. The Race/Topic section displays which state and candidates the data covers. The Poll section displays the source of the polling data. The Results section displays the percentage of support each candidate has received in the poll. The Spread section displays the percentage difference between the candidates and which candidate received the most support in the poll.