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Harper hit the two home runs in a Monday game against the Miami Marlins. 

Sen. Mark WarnerMark Robert WarnerConservatives leery of FBI deal on informant Overnight Finance: House sends Dodd-Frank rollbacks to Trump | What's in the bill | Trump says there is 'no deal' to help ZTE | Panel approves bill to toughen foreign investment reviews DHS secretary says she hasn’t seen assessment that Russia interfered to help Trump win MORE (D-Va.) was in the ballpark in Washington during the game.

And Senate Majority Leader Harry ReidHarry Mason ReidMcConnell not yet ready to change rules for Trump nominees The Hill's Morning Report — Sponsored by CVS Health — Trump’s love-hate relationship with the Senate Trump to press GOP on changing Senate rules MORE (D-Nev.) tweeted later on in the game that he hoped 2013 would be an "MVP season" for Harper. Harper, who is 20 years old, won the 2012 National League Rookie of the Year award.

Elsewhere on opening day, Sen. Chris MurphyChristopher (Chris) Scott MurphyDem senator: I support 'real' Second Amendment, not 'imaginary' one Frustrated Trump wants action on border wall, immigration Michigan Dem: Detroit-style pizza 'sweeping the nation' MORE (D-Conn.) struck what could be a pessimistic note for Red Sox fans.

The Red Sox faced off against the New York Yankees.