Associates and allies of Sen. Mitt Romney (R-UT) are backing the two candidates with the most centrist records in the Utah Republican Senate primary election, a fine line to walk as the rivals seek to distance themselves from the outgoing senator and portray themselves as the conservative option.

A number of prominent Romney donors and old staffers are backing Rep. John Curtis and former Utah House Speaker Brad Wilson — with Wilson inheriting a notable portion of Utah’s donor class, according to a review of campaign filings with the Federal Election Commission.