At least, not at the national level. It is impossible to rig a national election in the U.S., because the system is hyperfederalized -- run at the county level -- even a state Secretary of State plays almost no role in the process. A rigger would have to suborn 3,000 local elections offices.
See also the Brennan Center for Justice report, The Myth of Voter Fraud.
See also the Brennan Center for Justice report, The Myth of Voter Fraud.