Several liberal lawmakers want to apply utility-style regulations to Internet service providers. Sen. Edward Markey, a Massachusetts Democrat, collected signatures for a letter urging the Federal Communications Commission to regulate the Internet like the telephone system. Democratic Sens. Chuck Schumer of New York and Al Franken of Minnesota, as well as independent Sen. Bernie Sanders of Vermont, have signed on, aides confirmed. The lawmakers have planned a Tuesday morning press conference with Internet advocacy groups. In the letter, the senators argue that stronger authority is necessary to enact strong net-neutrality rules to prevent broadband providers such as Comcast from manipulating...