By David Shepardson WASHINGTON (Reuters) -The White House on Monday said it is proposing $15 billion over 10 years in election assistance to states and to support vote-by-mail efforts. The 2023 budget proposal calls for $10 billion in new assistance to states for election equipment and personnel and to “increase access and security.” President Joe Biden is also proposing $5 billion to the U.S. Postal Service (USPS) to expand delivery capacity in underserved areas “and support for vote-by-mail, including making ballots postage free and reducing the cost of other election-related mail.” In the w…