Democrats have dropped efforts to block the state’s mail-in primary election June 9 after Clark County agreed to provide more in-person polling places in Las Vegas and election officials agreed to other changes intended to protect the rights of elderly and disadvantaged voters. Lawyers for Nevada’s Democratic Party, the Democratic National Committee and congressional campaign committee were scheduled to go before a state judge in Carson City on Thursday via telephone in search of an injunction expanding the number of polling places and mandating mailing of ballots to all registered voters.