Is a law prohibiting me from secretly giving an elected official a briefcase full of one million dollars constitutional? If so, why is it not the same if there'

Is a law prohibiting me from secretly giving an elected official a briefcase full of one million dollars constitutional? If so, why is it not the same if there's a law that says I can't secretly provide $1,000,000 in services to the same elected official in the form of political advertising? The authors of the U.S. Constitution had some pretty strong ideas on the idea of bribery; in fact, it's explicitly listed in Article 2, Section 4 as an impeachable offense. The public has a right to know when its politicians and government officials are receiving money (or goods and services) from outside entities.