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We report the temperature and magnetic field dependence of transportproperties in epitaxial films of the manganite La$_{1-x}$Ca$_{x}$MnO$_{3}$ inthe overdoped region of the phase diagram for $x > 0.5$, where acharge--ordered (CO) and an antiferromagnetic (AF) phase are present.Resistivity, magnetoresistance and angular dependence of magnetoresistance weremeasured in the temperature interval $4.2 ~\mathrm{K} < T < 300 ~\mathrm{K}$,for three concentrations $x = 0.52, 0.58$ and $0.75$ and in magnetic fields upto 5 T. The semiconductor/insulator--like behavior in zero field was observedin the entire temperature range for all three concentrations \textit{x} and theelectric conduction, at lower temperatures, in the CO state obeys 3D Mott'svariable--range hopping model. A huge negative magnetoresistance for $x = 0.52$and $x = 0.58$, a metal--insulator transition for $B > 3 ~\mathrm{T}$ for $x =0.52$ and the presence of anisotropy in magnetoresistance for $x = 0.52$ and $x= 0.58$ show the fingerprints of colossal magnetoresistance (CMR) behaviorimplying the existence of ferromagnetic (FM) clusters. The declining influenceof the FM clusters in the CO/AF part of the phase diagram with increasing $x$contributes to a possible explanation that a phase coexistence is the origin ofthe CMR phenomenon.

Magnetotransport properties of La$_{1-x}$Ca$_x$MnO$_3$ (0.52 $\leq x \leq$ 0.75): signature of phase coexistence