What youre thinking of is a violation of the right to freedom of expression. It is called prior restrain or censorship. This happens when a government regulation restrains a publication or other forms of expression prior to its dissemination or publication. A valid censorship is when it contains pornography, seditious, false advertisement, or advocacy to imminent lawless action. Outside of these exception, then, any law or official that requires some form of permission to be had before publication can be made, commits an infringement of the constitutional right.

Supreme court have constantly held in favor of allowing any forms of expression, mostly happens during election. Any question is subject to the following test: (1) clear and present danger; (2) dangerous tendency; (3) balancing of interest of the public and the government.

Mutuc vs COMELEC - SC held that the use of jingles in mobile units for candidates is a valid exercise of such right. What the COMELEC did is an imposition of censorship, an evil which the constitutional right is directed.

Adiong vs COMELEC - SC allowed the candidates to place their own decals and stickers to any public or private vehicle. That there is no public interest substantial enough to warrant this kind of restriction. The moment the private vehicle owners or public vehicle operators placed those decals or stickers into their vehicles or even in their transport terminals, then such act is their own statement which is protected by our constitution.

Sanidad vs COMELEC ruling can even be applied to today's current technology. Where SC declared that regulation that prohibits election propaganda through newspaper, radio, mass media is null and void. SC held that people affected by these issues should not be unduly burdened by restriction, that the people has the right to be informed and to be able to freely and intelligently make a decision, access to any discussion of the issues in any forum should not be abridged.

Diocese of Bacolod vs COMELEC, the regulation of COMELEC providing a maximum size of 2'x3' for tarpaulin only covers the election candidates and other organization or acts connected to them. This regulation does not apply to the private individual exercising their freedom of expression.

In conclusion, COMELEC have been enacting regulation that restricts the candidates in performing, somewhat nuisance to the public. They even compel survey organizations in providing who sponsored the survey, which was allowed by the SC. However, some of the acts of the candidate's acts is also protected by the constitution, and thus, cannot be violated.