Maryland Code, Election Law § 16-401

(1) give, transfer, promise, or offer anything of value for the purpose of inducing another person to sign or not sign any petition;

(2) request, receive, or agree to receive, anything of value as an inducement to sign or not to sign any petition;

(3) misrepresent any fact for the purpose of inducing another person to sign or not to sign any petition;

(4) sign the name of any other person to a petition;

(5) falsify any signature or purported signature to a petition;

(6) obtain, or attempt to obtain, any signature to a petition by fraud, duress, or force;

(7) circulate, cause to be circulated, or file with an election authority a petition that contains any false, forged, or fictitious signatures;

(8) sign a petition that the person is not legally qualified to sign;

(9) sign a petition more than once;  or

(10) alter any petition after it is filed with the election authority.