By Dan Weil Seven Republicans and one Democrat traded $229,000 of bitcoin, $40,000 of ether and $32,000 of dogecoin. Members of Congress are often seen as lagging far behind social trends. But apparently that’s not the case with cryptocurrencies. Eight legislators or their immediate family members have bought or sold digital currencies over the last year, according to a CNBC analysis based on congressional financial disclosures and information from Capitol Trades database. Lawmakers disclose their trades in ranges. Using the midpoint, the bets from the eight members started at a low of $1,000 …