Cached information can help websites load faster, but it can also prevent you from seeing the most up-to-date version of a webpage; in some cases, it can also cause the webpage to load improperly or fail to load at all. You can clear the cache in all popular browsers, including Chrome, Firefox, Edge, Internet Explorer, and Safari.
About one-third of the Senators in Congress are elected every two years. This means the 33 are up for election at any one time.
There are 24 Republican seats and 10 Democratic seats up for re-election. In 2016, the Democratic Party will need to pick up five seats in the Senate in order to regain the majority they lost in 2014. The majority of the Republican incumbents up for re-election in 2016 were first elected in 2010 during the tea party movement.