Here we go again…..
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More than 20 Republican-held Senate seats will be up for election in 2016, and conservative political operatives are already looking at which GOP incumbents could be vulnerable to conservative primary challengers.

At the same time, some of these conservatives acknowledge the 2016 Senate elections may be more about protecting the senators swept into office during the tea party wave of 2010 rather than ousting other incumbents during the primaries.