The Hill, in journalistic Beltwayese:
Republicans strategists are worried that Rep. Paul Ryan's (R-Wis.) addition to the presidential ticket will cost their party House and Senate seats this fall.
Their concern: Democrats will successfully demonize Ryan’s budget plan, which contains controversial spending cuts and changes to Medicare [italics mine].
In English:
Republican strategists worry that Democrats will successfully expose Ryan's controversial budget plan, which contains demonic spending cuts and voucherizes Medicare into bootless oblivion.